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Commitments And Contingent Liabilities (Environmental Matters) (Detail) | 6 Months Ended |
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Jun. 30, 2017 USD ($) Potentially_Responsible_Party entity site Station Plant mi | Mar. 31, 2007 Potentially_Responsible_Party
Site Contingency [Line Items] |  |
Number of miles related to the Passaic River constituting a facility as determined by the US Environmental Protection Agency | mi | 17 |
Number of miles on Passaic River tidal reach required to be studied as determined by the US Environmental Protection Agency | mi | 8 |
Cash out settlement offer for PRPs with minimal responsibility | $ 280,600 |
Number of additional legal entities contacted by EPA in conjunction with Newark Bay study area contamination | entity | 11 |
Number of operating electric generating stations located on Hackensack River | Station | 2 |
Number of former MGP contamination sites located on Hackensack river in conjunction with Newark Bay study area contamination | site | 1 |
PSE And G [Member] |  |
Site Contingency [Line Items] |  |
Percentage of cost attributable to potentially responsible party | 7.00% |
Power [Member] |  |
Site Contingency [Line Items] |  |
Ownership percentage of Keystone Coal fired plant in Pennsylvania | 23.00% |
Psd Nsr Regulations Site Contingency [Member] | Power [Member] |  |
Site Contingency [Line Items] |  |
Penalty per day from date of violation-minimum | $ 25,000 |
Penalty per day from date of violation-maximum | $ 37,500 |
Pse G S Former Mgp Sites [Member] |  |
Site Contingency [Line Items] |  |
Number of potentially responsible parties ("PRPs") in connection with environmental liabilities for operations conducted near Passaic River | Potentially_Responsible_Party | 51 | 73
Loss Contingency, Estimate of Possible Loss | $ 190,000,000 |
Total Spend of Study to date | 163,000,000 |
Company Share of Total Spend of Study to date | $ 12,000,000 |
Pse G S Former Mgp Sites [Member] | Power [Member] |  |
Site Contingency [Line Items] |  |
Percentage of cost attributable to potentially responsible party | 1.00% |
Passaic River Site Contingency [Member] |  |
Site Contingency [Line Items] |  |
Estimated Cleanup Costs EPA Preferred Method | $ 2,300,000,000 |
Accrual for Environmental Loss Contingencies | $ 57,000,000 |
Number Of Additional Potentially Responsible Parties Directed By New Jersey Department Of Environmental Protection To Arrange Damage Assessment For Lower Passaic River | Potentially_Responsible_Party | 56 |
Estimated cleanup costs agreed to by two potentially responsible parties | $ 80,000,000 |
Estimated cost of interim natural resource injury restoration | $ 950,000,000 |
Passaic River Site Contingency [Member] | PSE And G [Member] |  |
Site Contingency [Line Items] |  |
Number of former generating electric station | Plant | 1 |
Number of former Manufactured Gas Plant (MGP) sites | Plant | 4 |
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) | $ 36,000,000 |
Accrual for Environmental Loss Contingencies | 46,000,000 |
CPG Targeted Method Cleanup Costs Low Estimate | 10,000,000 |
Passaic River Site Contingency [Member] | Power [Member] |  |
Site Contingency [Line Items] |  |
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) | 8,000,000 |
Accrual for Environmental Loss Contingencies | 11,000,000 |
CPG Targeted Method Cleanup Costs Low Estimate | 3,000,000 |
Mgp Remediation Site Contingency [Member] | PSE And G [Member] |  |
Site Contingency [Line Items] |  |
Remediation Liability Recorded As Other Current Liabilities | 74,000,000 |
Remediation Liability Recorded As Other Noncurrent Liabilities | 299,000,000 |
Regulatory Assets | 373,000,000 |
Remedial Investigation And Feasibility Study [Member] |  |
Site Contingency [Line Items] |  |
Estimated, total cost of the study | 30,000,000 |
Estimated Total Cost Of Study Low End of Range | $ 25,000,000 |
Passaic River mile 10.9 contaminant removal [Member] |  |
Site Contingency [Line Items] |  |
Percentage of cost attributable to potentially responsible party | 3.00% |
Minimum [Member] | Passaic River Site Contingency [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 518,000,000 |
Minimum [Member] | Passaic River Site targeted remedy [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 518,000,000 |
Minimum [Member] | Mgp Remediation Site Contingency [Member] | PSE And G [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 373,000,000 |
Accrual for Environmental Loss Contingencies | 373,000,000 |
Maximum [Member] | Passaic River Site Contingency [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 3,200,000,000 |
Maximum [Member] | Passaic River Site targeted remedy [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 772,000,000 |
Maximum [Member] | Mgp Remediation Site Contingency [Member] | PSE And G [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 430,000,000 |

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